iphone 6 short after installing pmic (need help)

[KE6SOLTI]

phone was in touch problam,i reball touch is and not done,then i reball pmic. now phone is short. i change pmic also but no luck. for check pm ic i install pmic in to other working phone and that was also dead ans short. short on that cap showing in pic. please help me to solve this problam.

thanks

[dog68]

Ok, It seems the pmic is bad, and Q1403 needs replacing. Short on VCC MAIN.

[KE6SOLTI]

but i change 3 pmics

[KE6SOLTI]

where is q1403 located on pcb,can you please provide me service manual

[radman666]

you have to reball the cpu

[mawaqas]

q1403 is located next to U1401 on the back near U2

[KE6SOLTI]

ok i solve this probLAM, THERE IS GPU PART IS SHORT UNDER CPU.

[vinse]

hello how did you solve that did you remove the gpu ??

[vinse]

that's happend when you peut pmic to close to the cumulus the VCC_MAIN is relied directly to the PP_GPU that's caus short on GPU so you have to change the GPU

[tojaert]

how change the gpu in iphone 6? Vinse- can U explain?

[vinse]

Originally Posted by tojaert

how change the gpu in iphone 6? Vinse- can U explain?

this is hard to do i tryed but no result i will try again and post how to do you have to change the entier CPU

[tojaert]

hello,

is it mainboard for repair? is it done or what?

[vinse]

in my case no it's not a board for repaire i have a few board for test they have no value for me so i can be less carrfule

in this case if you have short on PP_GPU or PP_CPU or PP_VARSOC you have to remove all on those lines capacitor resistor ,etc
and let only the CPU if the short is not gone that meens it's under the CPU you can use two methode i never succed on those cause i m not finished yet

remove the undefil around the CPU ( 290° C air flow 70 1,5 cm) and remove the first layer of the CPU (SDRAM) (325°c same aire flow 1cm )
remove again the underfil wich is still on the second part of the CPU (still welleded on the board ) same heat values
and gentelly remove the CPU (be carrfull of not damages pads)

then clean all underfill check for all if they are not short
clean CPU both side and SDRAM ..
reball the CPU and the SDRAM and put them back in place (i repeat i never dont this part ).. i'm not an expert i do that only as hobby .

if it's you board go it's good way to practice if not don't !!
i you have damaged a custumer board friend the honnesty is to by him an other one !!

[qwertybasse]

GREEN UV Solder Mask Ink for iphone BGA Reballing Stencil Paint-shedding BGA Repair Tools